package com.xjrh.traintravel.collector.common;

import org.springframework.util.DigestUtils;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @author snps
 * @create 2022-02-22 14:29
 * @describe
 **/
public class MD5Utils {

    public static String stringToMD5(String plainText) {
        byte[] secretBytes = null;
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(
                    plainText.getBytes());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("没有这个md5算法！");
        }
        String md5code = new BigInteger(1, secretBytes).toString(16);
        for (int i = 0; i < 32 - md5code.length(); i++) {
            md5code = "0" + md5code;
        }
        return md5code;
    }

    public static void main(String[] args) throws NoSuchAlgorithmException {
        // MessageDigest md = MessageDigest.getInstance("MD5");
        // java自带工具包MessageDigest
        String resultString = MD5Utils.stringToMD5("123456");
        System.out.println(resultString);
        // e10adc3949ba59abbe56e057f20f883e

        String resultString1 = MD5Utils.stringToMD5("1234");
        System.out.println(resultString1);
        //81dc9bdb52d04dc20036dbd8313ed055

        // spring自带工具包DigestUtils
        System.out.println(DigestUtils.md5DigestAsHex("1234".getBytes()));
        // 81dc9bdb52d04dc20036dbd8313ed055
    }

}
